diff --git a/RTL/System.pas b/RTL/System.pas
index 2899308..1f6e10f 100644
--- a/RTL/System.pas
+++ b/RTL/System.pas
@@ -6,6 +6,13 @@ unit System;
 
 interface
 
+const
+{$IF CompilerVersion < 15}
+  RTLVersion = 14.2006;  // <---,
+{$ELSE}                  //      June, 2020
+  RTLVersion = 15.2006;  // <---'
+{$IFEND}
+
 type
   PPAnsiChar = ^PAnsiChar;